hamburger



A. HAMBURGER. PROCESS OF TREATlNG CINEMATOGBAPH FILMS.

APPLICATION FILED FEB. 4.19l9.

2 SHEETS-SHEET 1.

1,308,709. Patented July 1, 1919 ATTORNEY UNITED STATES PATENT OFFICE.

ARON HAMBURGER, OF MAYFAIR, LONDON, ENGLAND.

, PROCESS OF TREATING CINEMATOG-RAI'H-FILMS.

Process of Treating Cinematograph-Films,

of which the following is a specification.

This invention relates to the production of cinematograph films in color.

It has been proposed to prepare cinematograph films by printing a doubly sensitized film from complementary color negatives,

I taneously.

one of which is reversed, and then coloring the developed images eachwith its appropriate color. This has, however, hitherto involved either the incorporation of chemicals for the coloring operation in the emulsion on each side or the successive treatment in separate operations of each side of the film while the other is protected.

The object of'the present invention is to avoid the difliculties introduced by the incorporation of colortonin or dyeing chemicals in the emulsion on t e one hand, and on the other to avoid the hitherto necessary protective coating of one side of the film prior to the'other side being treated.

This invention consists broadly in causing a doubly sensitized cinematograph film printed, preferably simultaneously and developed on both sides to be colored on both sides simultaneously or practically simul- The invention further consists in causing dye impregnated bands or bands of pigmented paper to be passed between pressing rollers, the double printed film to be dyed, which may or may not have been previously bleached, being introduced between the bands as they pass between the pressing rollers, which are preferably disposed on practically vertical axes.

The invention further consists in employing dye fixing rollers preferably immediately behind the first pressing rollers.

-The invention also consists .in feeding a double printed bleached film between a pair of clam-ping frames, adapted to clamp the the film between. them, and making fluid tight joints around the edges, and arranging for dyeing fluids to be brought into contact with the film within the frames on each side, to effect the dyeing, the fluid circulation arrangements being such that the fluids are i kept separate.

Specification of Letters Patent.

Application filed February 4, 1919. Serial No. 274,966.

form of apparatus is shown, by way of example, in the accompanying diagrammatic drawings, in which Figures 1 and 2 show in plan and elevation, views of the general arrangement of the operative parts of a machine for dyeing a continuous sensitized film on each side with a suitable dyeing fluid.

Figs. 3 to 7 show a modification in which a series of frames in chain form are arranged around'suitable spring-pressed polygonal rollers for carrying the dyes instead of employing absorbent bands.

Fig. 3 is an end elevation of the complete machine.

Fig. 4 is a plan.

Fig. 5 is a detail plan of a joint between the ends of two elements or frames.

Fig. 6 is an elevation of one element or frame, and

' Fig. 7 is a section on the line 77 of Fig. 6 showing two elements pressed together.

The machine shown in Figs. 1 and 2 is provided with means for carrying a double printed bleached film a and passing it between a pair of suitably operated pressing rollers b b by which the continuous bands 0 c of porous absorbent material charged with the dyeing fluid and the film is fed.

The machine is also provided with guide or tension rollers d d", and at a point beyond the pressing rollers b b there are conveniently a pair of dye fixing perforated rollers e e emitting dry steam on the dye bands to fix the dye on such portion'of same as is required to be dyed, around which sets of rollers the continuous bands are in engagement. At points intermediate of the tension rollers and the pressing rollers suitable means indicated by z are provided for keep ing the absorbent bands 0' c suitably saturated with the dyein fluid. I

The'film and the yeing bands are caused to pass slowly through the rolls, the rate being such as will permit of the d eing being properly effected. The film is t en washed off and fixed in the usual way.

In carrying the invention into effect in another foim, instead of employing absorbent bands to carry the dyes I mount a series of frames in chain form around suitable spring-pressed ,7 polygonal rollers. These frames act in a. similar manner to those described in the specification of my copending application No. 272201, filed Jan. 20, 1919, and are preferably closed shallow tanks, the

closure of which is effected on the outside by glass plat%, and on the inside by jointing Fig. 5. The two halves forming a complete cell, one half being carried on one series of drums and the other on a second series, are registered by means of tapered uiding pins n which enter tapered holes, and the frames as a whole are positioned with respect to the drums by projections p on the latter entering holes 0 on the former. Th two halves of the frames (and the drums e) are normally caused to approach by means of a spring indicated by g, and a simple linkage r can be provided for moving them to and fro. The dye may conveniently be fed from tanks 1' disposed centrally within the chains of frames around the rollers and means may conveniently be provided for raising or low- I ering these tanks; for instance, they can be mounted on standards 8 and held in the top position by a swinging link at which can be moved by hand so that the tanks can be lowered into the bottom position. They are raised to cause the flow of the fluid into the tank chambers, and lowered to with-- draw the fluid therefrom; or again, in another arrangement the fluidsmay be caused to circulate through jets, which play upon the film while it is clamped between the frames. When dyeing has been effected, the

chains are moved on one link and the operations repeated on the next section of film...

The film is also arranged to be fed on through washing, fixing and drying appliances, as usual.

In another method of carrying this invention into eifect, I effect the bleaching and 'pigmenting in one operation, by providing a bath the composition of which is given below in which the strips of carbon paper or dye gelatin paper are caused to be soaked for a suitable time, say five minutes, on their,

passage to the two pairs of pressing rolls above described. They are allowed to remain in contact with the film to be dyed a suflicient time and are then fed forward into a position where the carbon paper is brought into contact with hot water for desuccesslve portions of the length of said mo -roe velopment or, in the case of the dye paper, with cold water for washing. Simultaneous bleaching and pigmenting is thus eflected. r

The required combined bleaching and pig.-

menting solution for use either with dye'ofi bands or carbon pigment paper is prepared from the following ingredients Copper sulfate 4: oz. Potassium bromid 1400 grs.- 0 Potassium bichromatel 180 grs.

H. Cl minims.

The copper sulfate is dissolved with the potassium bromid in 20 oz. of water, and the potassium bichromate in another equal quan I5 tity of water, with the indicated H. Cl. added. The two solutions are then 'mixed slowly while stirring well and the resultin solution is ready for use. The dyes require are for greenish blue, basic methylene blue, which should be as nearly as possible devoid of red, and for magenta red basic fuchsin red which should be as nearly as possible devoid of green.

Having now described my invention what I claim as new and desire to secure by Letters Patent is 1. A method for producing cinematograph films in color on a film sensitized on both sides which consists in printing and developto ing the film and then coloring both sides practically simultaneously.

2. A method for producing cinematograph films in color on a film sensitized on both sides which consists in printing and developing the film and then dyeing both sides practically simultaneously.

3. A method of dyeing the two sides of a 1 continuous film bearing images on both sides consisting in forcing dye containing material against each side of the film substantially simultaneously.

4. In colorin cinematographic film, the herein descri process which comprises positionin successive portions of the length of the sai film betweensuccessive pairs of boxes to form containers on both sides of such cinematographic film, such containers being separated by .said film, and subjecting the two sides of any given one of said portions of film, substantially simultaneously to the action of coloring solutions, and repeating such last-mentioned operation with film. v 115 In testimony whereof I have signed my name to this specification.

ARON HAMBURGER. 

